html,
body {
  margin: 0;
  display: flex;
  width: 100%;
  height: 100%;
}
.container {
  width: 500px;
  height: 250px;
  margin: auto;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  .mouth-wraper {
    width: 5em;
    height: 5em;
    position: relative;
    z-index: 2;
    .top {
      width: 5em;
      height: 2.5em;
      border-radius: 10em 10em 0 0;
      background-color: orange;
      transform-origin: 50% 100%;
      transform: rotate(-45deg);
      animation: mouthmove 0.5s linear 0.7s infinite alternate;
    }
    .bottom {
      width: 5em;
      height: 2.5em;
      border-radius: 0 0 10em 10em;
      background-color: orange;
      transform-origin: 50% 0%;
      transform: rotate(45deg);
      animation: mouthmove 0.5s linear 0.7s infinite alternate;
    }
  }
  .dot {
    width: 20px;
    height: 20px;
    background-color: yellowgreen;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    right: 5em;
    z-index: 1;
    transform: translate(0, -50%);
    &:nth-child(2) {
      animation: dotmove 1.2s 0s linear infinite;
    }
    &:nth-child(3) {
      animation: dotmove 1.2s 0.4s linear infinite;
    }
    &:nth-child(4) {
      animation: dotmove 1.2s 0.8s linear infinite;
    }
  }
}

@keyframes mouthmove {
  100% {
    transform: rotate(0);
  }
}

@keyframes dotmove {
  0% {
    transform: translate(0, -50%);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }

  100% {
    transform: translate(-150px, -50%);
  }
}
